1,478 research outputs found
Indoor Radon And Radon Progeny Survey At Campinas-brazil Using Cr-39: Final Results
No full textIn a survey performed at Campinas-SP, Brazil, the CR-39 detector was used as an alpha-spectrometer taking into account the size and the gray level of round tracks measured under an automatic optical microscopy system. The exposures were carried out in the same room of 70 dwellings during two successive periods of six months: the first one from November 1996 to May 1997 (summer exposure) and the second one from May 1997 to December 1997 (winter exposure). The results of the assessment of radon and radon progeny (RP) joint activity in the air neighboring the detector and the plated-out RP activity on the material surfaces are given. © 2008 Elsevier Ltd. All rights reserved.43SUPPL.1S440S444Abu-Jarad, F., Radon measurements inside houses using nuclear track etch detectors (1989) Proceedings of the International Workshop on Radon Monitoring in Radioprotection, Environmental Radioactivity and Earth Sciences, ICTP, Trieste, Italy, April 3-14, pp. 445-456. , World Scientific Publishing Co. Pte. Ltd., SingaporeAmgarou, K., Font, L., Baixeras, C., A novel approach for long-term determination of indoor 222Rn progeny equilibrium factor using nuclear track detectors (2003) Nucl. Instrum. Meth. A, 506, pp. 186-198Durrani, S.A., Ilic, R., (1997) Radon Measurements by Etched Track Detectors: Applications in Radiation Protection, Earth Sciences and the Environment, , World Scientific Publishing Co., LondonGuedes, S., Hadler, J.C., Iunes, P.J., Navia, L.M.S., Neman, R.S., Paulo, S.R., Rodrigues, V.C., Zúñiga, A., Indoor radon daughters survey at Campinas-Brazil using CR-39: first results (1999) Radiat. Meas., 31, pp. 287-290Hadler, J.C., Paulo, S.R., Indoor radon daughters contamination monitoring: the absolute efficiency of CR-39 taking into account the plate-out effect and environmental conditions (1994) Radiat. Protect. Dosim., 51 (4), pp. 283-296Lung cancer risk from indoor exposures to radon daughters (1987) Ann. ICRP, 17, pp. 1-60. , ICRP Publication 50Leung, S.Y.Y., Nikezic, D., Yu, K.N., Passive monitoring of the equilibrium factor inside a radon exposure chamber using bare LR115 SSNTDs (2006) Nucl. Instrum. Meth. A, 564, pp. 319-323Paulo, S.R., Neman, R., Hadler, J.C., Iunes, P.J., Guedes, S., Balan, A.M.O.A., Tello, C.A., Radon surveys in Brazil using CR-39 (2005) Radiat. Meas., 39 (6), pp. 657-660Planinic, J., Radolic, V., Faj, Z., Suveljak, B., Radon equilibrium factor and aerosols (1997) Nucl. Instrum. Meth. A, 396, pp. 414-417Soroka, Y., Molchanov, A., Radiation and radon survey of Akchatau (Kazakhstan) and experience with radon remedial measures (1998) Radiat. Protect. Dosim., 78, pp. 231-236WHO, 1988. Man-made mineral fibres and radon. In: IARC Monographs on the Evaluation of Carciogenic Risks to Humans, vol. 43, pp. 173-25
Radon Surveys In Brazil Using Cr-39
No full textIn this work results of two radon daughters survey in Brazil are presented and discussed. Some methodological problems concerning the first survey are pointed out which were corrected for the second survey in order to make a realistic long-term measurement of radon decay products in the air. The technique employed in both surveys was the alpha-spectroscopy using CR-39. The reliability of this technique as well as the results of the second survey are discussed, which indicate a poor correlation between radon and its decay products in the air at the researched dwellings. © 2005 Elsevier Ltd. All rights reserved.396657660Guedes, S., Hadler Neto, J.C., Iunes, P.J., Navia, L.M.S., Neman, R.S., Paulo, S.R., Rodrigues, V.C., Zuniga, A., Indoor radon and radon daughters survey at Campinas, Brazil using CR-39: First results (1999) Radiat. Meas., 31, pp. 287-290Hadler Neto, J.C., Paulo, S.R., Indoor radon daughters contamination monitoring: The absolute efficiency of CR-39 taking into account the plate-out effect and environmental conditions (1994) Radiat. Prot. Dosim., 51, pp. 283-296Hadler Neto, J.C., Iunes, P.J., Osório Araya, A.M., Paulo, S.R., Relationship between track size and energy for alpha particles in CR-39 (1991) Nucl. Tracks Radiat. Meas., 19, pp. 313-317Magalhães, M.H., Amaral, E.C.S., Sachett, I., Rochedo, E.R.R., Radon-222 in Brazil: An outline of indoor and outdoor measurements (2003) J. Environ. Radioactivity, 67, pp. 131-143Malanca, A., Gaidolfi, M., Environmental radon in some Brazilian towns and mines (1997) Radiat. Prot. Dosim., 69, pp. 211-216Neman, R., (2000) Medida Da Contaminação Radioativa Do Ar Ambiental Por radônio-222 E Filhos Em Residências De Campinas-SP, , Brasil. Master Thesis, Universidade Estadual de Campinas (in Portuguese)Neman, R.S., Schmitman, I.D., Hadler Neto, J.C., Iunes, P.J., Paulo, S.R., Guedes, S., Measurement of indoor 222Rn using CR-39 under a thin film geometry (2001) Radiat. Meas., 34, pp. 145-148Nikolaev, V.A., Ilić, R., Etched track radiometers in radon measurements: A review (1999) Radiat. Meas., 31, pp. 1-1
R.S. Peters' Comprehensive Theory of Moral Education
No full textThis article presents R.S. Peters’ theory of moral education embedded in his broad conception of morality. The author examines Peters’ views against the background of Kohlberg’s stage theory of moral development; hence, the positions of both thinkers are interwoven throughout the discussion. It addresses some central issues relevant to moral education such as, for example: cognitive and affective aspects of morality, and the acquisition of virtues. In the article the author argues that Peters’ account of moral development and moral education provides supplementation for the somewhat narrow theory developed by Kohlberg, thus establishing a broader framework relevant to moral education.status: Publishe
Combining Fault Analysis Technologies for ISO26262 Functional Safety Verification
No full textThe development of Integrated Circuits for the Automotive sector imposes on complex challenges. ISO26262 Functional Safety requirements entail extensive Fault Injection campaigns and complex analysis for the evaluation of deployed Software Tools. This paper proposes a methodology to improve Fault Analysis Tools Confidence Level (TCL) by detecting errors in the classification of faults. By combining the strengths of Automatic Test Pattern Generators (ATPG), Formal Methods and Fault Injection Simulators we are able to automatically generate a Test Environment that enables the validation of the tools and provides supplementary information about the design behavior. Our results showed fault detection rates above 99% including information to improve ISO26262 metrics calculationAccepted author manuscriptComputer EngineeringQuantum & Computer Engineerin
Transition and wavy walls: an experimental study: An experimental study
No full textA wide body of research exists which explores the effects of surface roughness or patterned wall shapes on instability growth and transition. Building on those works as well as recent experiments demonstrating passive laminar flow control using arrays of discrete roughness [3, 8], a set of spanwise-wavy walls is designed with the goal of suppressing instability growth in two-dimensional boundary layers. In a numerical investigation of Tollmien-Schlichting (TS) wave growth in the presence of streamwise boundary-layer streaks, Cossu and Brandt [1] found that stabilization of TS waves results from spanwise shear in the mean flow, which forms a negative contribution to production in the perturbation kinetic energy equation. Whereas previous efforts have employed streamwise vorticity developing in roughness wakes to provide the requisite mean-flow deformation, in this work stabilization is achieved through modulation of the no-slip surface. Miniature vortex generators (MVGs) have proven an effective means of producing streamwise streaks for transition delay [8], though relatively large streak amplitudes are necessary to counter their eventual decay through viscous dissipation. The notion motivating this work is that spanwise-wavy walls extended in the streamwise direction can produce a similar effect while avoiding bypass transition resulting from large-amplitude streamwise streaks. Toward that end, six wavy walls are used in a modular test model. When TS waves are excited upstream of the wavy walls, substantial delays in the onset of transition are observed for certain spanwise wavelengths compared with the flat-plate reference case
Milczące życie liter. O związku języka i przyrody w poezji R.S. Thomasa
No full textJoanna SoćkoSilent Life of Letters. On Interconnections between Language and Nature in the Poetry of R.S. Thomas.The essay sets out to explore R.S. Thomas’ (1913–2000) vision of the problematic relations between the man, the nature and their Creator. In the context of contemporary critique as well as the 20th century, post-husserlian philosophy, the author analyses Thomas’ cosmological poems and represents, on the one hand, the place that both man and God take in the creation and, on the other, the sacramental relationship between the human and the nature. What is important from this perspective is the material existence of both man and nature, which enables mutual infiltration that leads to discovery of imperceptible dimension of materiality, which, in turn, influences both human consciousness and language. This is why the author asks about the role of science in Thomas’ poetry and about the influence that “the machine” has on language and consciousness.Joanna SoćkoSilent Life of Letters. On Interconnections between Language and Nature in the Poetry of R.S. Thomas.The essay sets out to explore R.S. Thomas’ (1913–2000) vision of the problematic relations between the man, the nature and their Creator. In the context of contemporary critique as well as the 20th century, post-husserlian philosophy, the author analyses Thomas’ cosmological poems and represents, on the one hand, the place that both man and God take in the creation and, on the other, the sacramental relationship between the human and the nature. What is important from this perspective is the material existence of both man and nature, which enables mutual infiltration that leads to discovery of imperceptible dimension of materiality, which, in turn, influences both human consciousness and language. This is why the author asks about the role of science in Thomas’ poetry and about the influence that “the machine” has on language and consciousness
Czwarty wymiar. Poezja R.S. Thomasa wobec pytania o (nie)obecność
No full textThe Fourth Dimension. R.S. Thomas’s Poetry and the Question of God’s AbsenceThe text deals with the poetry of R.S. Thomas (1913−2000) – a British author and an Anglican priest in the Church of Wales – whose works are full of controversial (given his priesthood) statements concerning the absence of God. As a lot of Thomas’s poems convey thoughts intersecting with post-secular reflection on the death of God, rooted in Derrida’s questioning of the “metaphysics of presence,” the article aims at tracing the inspirations behind Thomas’s quasi-religious poetry. The point of departure for this reflection is the poet’s recollection of being left by his parents alone for the first time. The impression of an empty house turns out to be an experience which shaped the poet’s attitude towards the disenchanted space he lives in. Although most critics claim that the apparent absence of God in Thomas’s poetry results directly from the tradition of theological via negativa, the author of the article pays attention to those characteristics which differentiate Thomas’s spirituality from the theological tradition and the most important difference between the poet’s attitude and the traditional model of Christian contemplation turns out to be time, or, more precisely, the temporal discrepancy between the possible accessibility of the transcendent being and the man’s ability to “catch it at work.
Czwarty wymiar. Poezja R.S. Thomasa wobec pytania o (nie)obecność
No full textThe Fourth Dimension. R.S. Thomas’s Poetry and the Question of God’s AbsenceThe text deals with the poetry of R.S. Thomas (1913−2000) – a British author and an Anglican priest in the Church of Wales – whose works are full of controversial (given his priesthood) statements concerning the absence of God. As a lot of Thomas’s poems convey thoughts intersecting with post-secular reflection on the death of God, rooted in Derrida’s questioning of the “metaphysics of presence,” the article aims at tracing the inspirations behind Thomas’s quasi-religious poetry. The point of departure for this reflection is the poet’s recollection of being left by his parents alone for the first time. The impression of an empty house turns out to be an experience which shaped the poet’s attitude towards the disenchanted space he lives in. Although most critics claim that the apparent absence of God in Thomas’s poetry results directly from the tradition of theological via negativa, the author of the article pays attention to those characteristics which differentiate Thomas’s spirituality from the theological tradition and the most important difference between the poet’s attitude and the traditional model of Christian contemplation turns out to be time, or, more precisely, the temporal discrepancy between the possible accessibility of the transcendent being and the man’s ability to “catch it at work.
Measurement Of Indoor 222rn Using Cr-39 Under A Thin Film Geometry
No full textIn this work an assembly for indoor 222Rn measurement is presented. This assembly is made up of two acrylic plates (14 cm×14 cm) separated by a distance of 4 mm. To prevent radon daughters from outside entering the assembly (and produce alpha particle tracks striking the CR-39 detector placed in the central region of one of these plates), the borders of these plates were progressively closed, leaving open only a rectangular aperture of 5 mm×4 mm. The size of this opening was determined experimentally, by exposing in two indoor environments assemblies with different apertures as follows: (i) all borders open; (ii) two borders closed; (iii) three borders closed; (iv) four borders closed but one containing a 6 cm×4 mm opening; (v) four borders closed but one containing a 2.5 cm×4 mm opening and (vi) four borders closed but one containing a 0.5 cm×4 mm opening. Track density shows a noticeable decrease between assembly (i) and assembly (iii), remaining constant for smaller openings. Only 222Rn, a noble gas, should enter the assembly independently of the opening size. © 2001 Elsevier Science Ltd. All rights reserved.341-6145148Bigazzi, G., Hadler, N.J.C., Paulo, S.R., On indoor radon contamination monitoring with plastic nuclear track detectors: The influence of plate-out effect (1988) Nucl. Tracks Radiat. Meas., 15 (1-4), pp. 539-542Bigazzi, G., Hadler, N.J.C., Paulo, S.R., On indoor radon contamination monitoring with SSNTDs: Experimental results concerning plate-out and self-plate-out effects (1989) Nucl. Instr. and Meth. A, 280, pp. 506-509Guedes, S.O., Hadler, N.J.C., Iunes, P.J., Navia, L.M.S., Neman, R.S., Paulo, S.R., Rodrigues, V.C., Zúñiga, A.G., Indoor radon daughters survey at Campinas-Brazil using CR-39: First results (1999) Radiat. Meas., 31, pp. 287-290Hadler, N.J.C., Paulo, S.R., Indoor radon daughters contamination monitoring: The absolute efficiency of CR-39. Taking into account the plate-out effect and environmental conditions (1994) Radiat. Prot. Dosim., 51, pp. 283-296Nikolaev, V.A., Ilic, R., Etched track radiometers in radon measurements: A review (1999) Radiat. Meas., 30, pp. 1-13Paulo, S.R., (1991) Dosimetria ambiental de rn-222 e filhos: Medida da eficiência absoluta do CR-39 levando-se em conta os efeitos do plate-out e fatores ambientais, , Ph.D. Thesis, IFGW, UNICAMP, Brazi
MANOVA modelling of a chiropractic longitudinal study using multiple imputation
No full textThe purpose of this report is to present the detailed statistical analysis of a randomised, placebo-controlled trial comparing two different treatment modalities to an intervention of no known benefit for people with acute or subacute thoracic spine pain.
The therapy arms consist of Spinal Manipulative Therapy (SMT) and Graston Technique (GT) and the placebo is a non-functional ultrasound. A placebo group was utilised because at present there are no proven treatments for non-specific thoracic pain. This trial is registered with the Australia and New Zealand Clinical Trials Registry. Ethics approval has been granted by Murdoch University Human Research and Ethics Committee, number 2007/274.
The aim of this three arm trial was to test the efficacy of SMT and GT as independent modalities compared to detuned ultrasound for the outcomes of pain and disability. The latter were measured using the Visual Analogue Scale (VAS) and a modified Oswestry Back Pain Disability Index. The study was conducted at the Murdoch University Chiropractic student clinic in Perth, Australia, and the protocol published in Crothers et al (2008).
In this report, Section 2 provides an initial exploratory analysis of the data, Section 3 outlines the statistical models used in the final analysis, Section 4 defines these models in mathematical terms, Section 5 discusses the management of missing values via multiple imputation and Section 6 presents the results of the statistical modelling and hypothesis tests. The clinical study will be published in full elsewhere
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